Most farmers markets are "green" in concept — you're likely buying products directly from farmers and artisans, as opposed to them sending their wares to the store — but few take it as seriously as Green City Market. Open in the south end of Lincoln Park on Wednesdays and Saturdays from May until October (and in the Peggy Notebaert Nature Museum in the winter), this unique market offers local, sustainable foodstuffs from purveyors that are heavily vetted before being allowed in. The result is fresh, delicious food that you can feel good about eating.